<div class="row-fluid">
  <div class="span12 element">
    <div class="bordered">
      <div class="navbar section">
        <div class="navbar-inner top">
          <label>Share with user:</label>
        </div>
      </div>
      <label>User:</label><input type="text" placeholder="Username" id="username">
    </div>
  </div>
</div>